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States → EPA Region 10 — Tribal Water Systems

Non-Transient Non-Community Water System · PWS 105300139

Wapato Headstart

Toppenish, EPA Region 10 — Tribal Water Systems 98948 - drinking water served from groundwater sources to 95 people, tracked in EPA SDWIS and UCMR5.

95
People served
681
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 681 drinking-water violations at Wapato Headstart.

681
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
95
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Wapato Headstart

Wapato Headstart is a native american-owned non-transient non-community water system that delivers drinking water to 95 residents in Toppenish, EPA Region 10 — Tribal Water Systems through 2 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 681 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 675 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is 2,3,7,8-TCDD, recorded in 15 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 10 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
95
Total Violations
681
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Native American
Connections
2
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
675
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
2,3,7,8-TCDD MR 15 2018
Methoxychlor MR 14 2018
Toxaphene MR 14 2018
Dalapon MR 14 2018
Diquat MR 14 2018
Endothall MR 14 2018
OXAMYL MR 14 2018
Di(2-ethylhexyl) phthalate MR 14 2018
Picloram MR 14 2018
Dinoseb MR 14 2018
Hexachlorocyclopentadiene MR 14 2018
Carbofuran MR 14 2018
Atrazine MR 14 2018
Endrin MR 14 2018
Heptachlor MR 14 2018
2,4-D MR 14 2018
2,4,5-TP MR 14 2018
HEXACHLOROBENZENE MR 14 2018
Benzo(a)pyrene MR 14 2018
Pentachlorophenol MR 14 2018
1,2-DIBROMO-3-CHLOROPROPANE MR 14 2018
Chlordane MR 14 2018
Simazine MR 14 2018
Glyphosate MR 14 2018
Heptachlor epoxide MR 14 2018
Total Polychlorinated Biphenyls (PCB) MR 14 2018
BHC-GAMMA MR 14 2018
ETHYLENE DIBROMIDE MR 14 2018
Di(2-ethylhexyl) adipate MR 14 2018
LASSO MR 13 2018

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Wapato Headstart.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID 105300139 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 10 — Tribal Water Systems Drinking Water Authority

EPA Region 10 — Tribal Water Systems's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find 10 regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 Revised Total Coliform Rule RPT 6 SDWIS / 105300139 / 8000
2023 Lead and Copper Rule MR 8 SDWIS / 105300139 / 5000
2021 Revised Total Coliform Rule MON 3 SDWIS / 105300139 / 8000
2018 2,3,7,8-TCDD MR 15 SDWIS / 105300139 / 2063
2018 Methoxychlor MR 14 SDWIS / 105300139 / 2015
2018 Toxaphene MR 14 SDWIS / 105300139 / 2020
2018 Dalapon MR 14 SDWIS / 105300139 / 2031
2018 Diquat MR 14 SDWIS / 105300139 / 2032
2018 Endothall MR 14 SDWIS / 105300139 / 2033
2018 OXAMYL MR 14 SDWIS / 105300139 / 2036
2018 Di(2-ethylhexyl) phthalate MR 14 SDWIS / 105300139 / 2039
2018 Picloram MR 14 SDWIS / 105300139 / 2040
2018 Dinoseb MR 14 SDWIS / 105300139 / 2041
2018 Hexachlorocyclopentadiene MR 14 SDWIS / 105300139 / 2042
2018 Carbofuran MR 14 SDWIS / 105300139 / 2046

How Wapato Headstart Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Wapato Headstart EPA Region 10 — Tribal Water Systems avg Federal benchmark
Total violations 681 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 95 - Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across all regulated public water systems in EPA Region 10 — Tribal Water Systems.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Wapato Headstart water safe to drink? ▼
Wapato Headstart (PWS ID: 105300139) has 681 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 95 people using Groundwater sources.
How many people does Wapato Headstart serve? ▼
Wapato Headstart serves 95 people in Toppenish, EPA Region 10 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 2 service connections.
What type of violations does Wapato Headstart have? ▼
Wapato Headstart has 681 total violations: 0 health-based violations (MCL exceedances or treatment failures), 675 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Wapato Headstart water? ▼
No PFAS testing data is available for Wapato Headstart under the EPA's UCMR5 monitoring program.
What water source does Wapato Headstart use? ▼
Wapato Headstart uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.